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Business Combinations - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 Y | Dec. 30, 2011 | Dec. 31, 2011 Y | Dec. 31, 2010 Entity Y
Business Acquisition [Line Items] |  |  |  |
Aggregate purchase price of acquisitions | $ 667,586,000 |  | $ 214,822,000 | $ 186,783,000
Cash payments for acquisitions | 483,933,000 |  | 167,444,000 | 158,636,000
Net additional consideration paid as note payable | 59,000 |  | 1,194,000 | 759,000
Other Payable | 25,439,000 |  |  |
Assumption of liabilities | 136,676,000 |  | 15,659,000 | 2,298,000
Recorded earn-out payable | 21,479,000 |  | 30,525,000 | 25,090,000
Average annual operating profit earned period, minimum (years) | 1 |  | 1 | 1
Average annual operating profit earned period, maximum (years) | 3 |  | 3 | 3
Number of acquisitions |  |  |  | 33
Total goodwill | 390,640,000 |  | 128,344,000 | 116,393,000
Goodwill currently deductible for income tax purposes | 52,730,000 |  | 84,105,000 | 91,303,000
Goodwill currently non-deductible for income tax purposes | 316,431,000 |  | 13,714,000 |
Goodwill related to the recorded earn-out payables | 21,479,000 |  | 30,525,000 | 25,090,000
Total revenues related to acquisitions | 129,472,000 | 40,291,000 |  | 30,172,000
Income before income taxes related to acquisitions | 898,000 | 7,223,000 |  | 3,255,000
Maximum future contingency payments related to acquisitions | 146,858,000 |  |  |
Percentage recognition by acquirer of fair value of acquired assets | 100.00% |  |  |
Estimated acquisition earn-out payables | 52,987,000 |  | 47,715,000 |
Other Non-Current Liability |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | 42,823,000 |  | 44,061,000 |
Accounts Payable |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | 10,164,000 |  | 3,654,000 |
Purchased customer accounts |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) |  |  |  | 15 years
Non-compete agreements |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) |  |  |  | 5 years
Arrowhead General Insurance Agency Superholding Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Other Payable | 22,061,000 |  |  |
Purchased customer accounts |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 15 years |  | 15 years |
Non-compete agreements |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 5 years |  | 5 years |
Retail |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisitions during period purchase price allocation goodwill expected tax deductible amount | 57,856,000 |  | 108,420,000 | 57,423,000
National Programs Divisions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisitions during period purchase price allocation goodwill expected tax deductible amount | 289,378,000 |  | 11,853,000 |
Wholesale Brokerage Divisions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisitions during period purchase price allocation goodwill expected tax deductible amount | 11,656,000 |  |  |
Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisitions during period purchase price allocation goodwill expected tax deductible amount | 31,750,000 |  | 8,071,000 | 58,970,000
Subsequent to January 1, 2009 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Maximum future contingency payments related to acquisitions | 146,858,000 |  |  |
Future earnings of acquired entities, term basis of potential earn-out obligations, minimum (years) | 1 |  |  |
Future earnings of acquired entities, term basis of potential earn-out obligations, maximum (years) | 3 |  |  |
Prior to January 1, 2009 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash payments for acquisitions | 2,907,000 |  | 3,781,000 | 975,000
Net additional consideration paid as note payable |  |  | 409,000 | 3,062,000
Additional net consideration paid allocated to goodwill | $ 2,907,000 |  | $ 4,190,000 | $ 4,037,000
Asset Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | 19 |  | 37 |
Stock Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | 1 |  | 1 |

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